Computing device.



F. C. CHURCH.

COMPUTING DEVICE.

APPLICATION HLED F53. 23. 1918.

` Patented N ov. 26, 1918.

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FRANK c. CHURCH, or erinnere? meenemen contraria, or n. nncfrrcor.

onmonconsonne ontzien.

Spe ccation et' leters Patent.

Patented Nov. 2e, 191s.

Application filed February 2S, 1918. Serial No. 218,717.

To all whom t may concern.'

Be it known that l, FRANK C. CHURCH, a citizen of the United States, and resident of the city of Cranston, in the county of Providence and State of Rhode island, have invented certain new and useful linprovements in Computing Devices, of which the following is a specification.

This invention relates to devices for facilitating computations such as those incident to the figuring of the United States War tar;

. ,on transportation tickets and "che like.

The objeot of this invention is to provide a rotatable disk lined oli into sections on which are indicated dollars, each section being subdivided and sait sub-divisions carrying fractions of me dollar. Each subdivision is also provided With a hole into which the point oi" a pencil or other sharp instrun'ient may inserted :tor the purpose oi rotating the disk to a designated position, to bring into view at a given point another set or' iigures on the face of the disk. to indicate the exact amount or" War tax to be added to the dollar or certain multiples thereof.

With these and other objects in view, the invent-ion, consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claim.

In the accompanying drawings:

Figure 1- is a trent or tace view oi? my improved fraction computingdevice, showing the 'front plate of the frame partially lorokenaivay to show the iigurcs which are arranged on the face of the rotatable disk.

Fig. 2 is a central sectional edge view of the device and indicating' in dotted lines the pencil point ot' which is" inserted. into one of the openings in 'the Referring' to the drawings, 1G the back plate of the 'traine or ny computing1 device, Which may ce in.y Y board or other suitable mate"ial and 11 incr eates the front plate of this frame, which is spaced apart from the back plate by means of the spacer member 19..

The center portion lat 13 or this :trout plate is removed exposing` a correspondingv portion of the calculating disk member 14 -which is rotatably'mounted on the pivot 15 in the back plate of the device. The face of this rotatable disk is divided by radio. lines 16 into ten sevments or sections which are numoered consecutively to indicate es many dollars. The outer circle of these segments is then sub-divided by radial lines 17 into nine spaces, each of which spaces contains two sets of figures, the tax on any amount inclusive of the two sets of figures in any one section being' the same. For instance for $33.44 to inclusive 'the tax is twenty eight cents; While the tax for $3.57 to $3.68 inclusive, is twenty nine cents, and so on.

@ne of the essential features of the construction of my device is the provision of a series of holes 1S, each beingr of a size adapted to receive the point of a lead pencil 27 so that the opeator may position the pencil into the hole opposite the am unt desired, and by it rotate the disk unil tl it yhole comes opposite the indicating` arrow 19, which brings to view the tax -for that amount in the opening 22, and the tax for multiples of that amount may be read through the openings 23, 24, and 26, said openings being formed in the outer plate and preferably at point diametrically opposite the. indicating arronv 19.

Above these openings is shown thenumorals 1, 10, 20, and 40, respectively, which indicate the number of dollars to be iigured und this plus the amount in the corresponding sector is the amount on which the War tax appearing in the opening below is gured.

ln operating the device it is only necessary to select e sector containingl the required number oi dollars, place the pencil point in the hole which is positioned opposite to the subdivision containing the additional nurnber of cents required. For instance to determine the tax on 953.57 tofpfzll or certain multiples of 'the dollar, place the pencil. peint in the hole opposite 'the space bearing,y oil-G8 in the $3.90 sector, revolre the disk so that the pencil point comes opposite the arrow 19, and 'the amount of tax will appear in the opposite openings as follows.

En the opening` marked 1 the amount of the $3.60 tan Will indicate twenty nine cents. ln the opening ma?. :ed ill Will appear the ani/.nuit olf tax for "..iiicl'i is $1.09. In the opening marked 29 will appear the amount oi? tan for $23.60 which is $139. ln the openingmarked 30 will be the amount otaX'-or $33.60 which is $2.69; and in the opening marked l0 Will be the amount of tax for $48.60 which is $3.49, and so on.

The figures in this table are based on an,V

'lllherefore when the tax on 8% tax which is levied on all transportation ticket-s sold.V This table as shown carries figures necessary for computing up to 550.00. an amount above $50.00 is to be figured, say for instance. $73.60, as it is known that the 8% tax on $50.00 is $4.00, it is now only necessary to i. find the tai/i on the $23.60, which is done by placing the point of `sector opposite the section 57,08, then by alpencil in the 953.00

rotating the disk to bring this point to the arrow and reading in the third opening under 20, We ind 951.89 tax, which added to the $4.00, the taX on $50, makes a total of $5.89, which added to the first cost et' the ticket, $73.00, makes 9579,49, total cost ci the ticket.

By this simple, inexpensive and efficient device it is seen that the United States war tax which is required to be added to all transportation tickets may be figured most accurately and also instantly and that without the possibility of mistake, which is a most important feature in the quick handling of hurrying people buying railroad or other transportation tic (ets.

The foregoing description is directed solely toward the construction illustrated, but I desire it to beunderstood that l reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claim.

l claim:

A con'iputing device of the character described comprising a frame having' a back and a face plate in spaced relation, the eentral portion of said tace plate being removed, a disk rotatably mounted between the hack and the face plate and having a portion exposed through the removed central portion ot' the face plate, said exposed portion beiner divided into a space adjacent the center, and an outer space concentrically Adisposed, the inner space being' divided intenten n'lajor segments, the outer spaceilieiiig`\\:ilso\ divided into nine minor segments to cach one of the major segments, each of the minor segments being provided with a hole adapted to he engaged hy an instrument to rot-ate the disk, the face oi' the unexposed portion of the said disk having;` an annular space marked oill into radial segments corresponding' to said minor segments, an indicating stop on the tace plate, said face platelnny'ing a series of openings exposing only that segment ot' the unexposed portion of the disk which corresponds with the selected segment opposite to sai'd stop, all of said segments containing related indicia.

In testimony whereof atl'ix'my signatureA in presence of two witnesses.

FRANK C. CHURCH.

ililitnesses c l-lowann ll. BAuLow, A. F. Macnmnr. 

